They are not good for anything other than a dead stock 200HP late 70 'wheezer" build.
My buddy built a nice little 400 with one. RAIV cam, home ported 62s, forged 5140 rods and TRW flat tops. It ran low 11s in a 70s Formula.
It ripped every main out of the block. The crank almost got shoved right out of the bottom of the block.
Shifted at 5800, not abused.
Do not waste your time.
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